Which Statement Concerning the Tautomeric Forms of Bases Such as Uracil

Multiple Choice

Which statement concerning the tautomeric forms of bases such as uracil is CORRECT?

A) The double-lactim form contains a ketone group.
B) The lactam form contains an alcohol group.
C) The lactam form predominates at neutral pH.
D) Formation of the lactim from the lactam is irreversible.
E) The lactim and double-lactim forms are stabilized at high pH.